Continuous preparation of alkyl esters of (meth) acrylic acid

Details Continuous preparation of alkyl esters of (meth) acrylic acid Continuous preparation of alkyl esters of (meth) acrylic acid

1996-03-20

1998-03-31

Killos, Paul J.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

C07C 6952

Patent

active

057340749

ABSTRACT:
The continuous esterification of a C.sub.1 -C.sub.8 -alkanol with (meth)acrylic acid in a molar ratio of from 1:1 to 2:1 in the presence of proton-donating catalysts in a homogeneous, liquid, solvent-free phase, in which the water of reaction and resulting alkyl (meth)acrylate are separated off continuously as part of an aqueous azeotropic mixture via the top of a rectification zone attached to the reaction zone, at a top pressure of from 0.1 to 1 atm, and worked up to give pure (meth)acrylate, is carried out by a process wherein the reaction temperature is from 100.degree. to 150.degree. C., the residence time is from 1 to 5 hours and from 5 to 20% by weight, based on the amount of reaction mixture, of sulfuric acid or an equimolar amount, based on such an amount of sulfuric acid, of an organic sulfonic acid is added as a protic acid catalyst to the reaction mixture present in the reaction zone.

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